title: Prediagnostic circulating parathyroid hormone concentration and colorectal cancer in the European Prospective Investigation into Cancer and Nutrition cohort.
abstract: BACKGROUND
  Parathyroid hormone (PTH) has been proposed to play a promoting role in carcinogenesis. However, no epidemiologic studies have yet directly investigated its role in colorectal cancer (CRC).
  
  
  METHODS
  A case-control study nested within the European Prospective Investigation into Cancer and Nutrition cohort was conducted with 1,214 incident, sporadic CRC cases matched to 1,214 controls. Circulating prediagnostic PTH and 25-hydroxy vitamin D [25(OH)D] concentrations were measured by enzyme-linked immunosorbent assays. Detailed dietary and lifestyle questionnaire data were collected at baseline. Multivariable conditional logistic regression was used to estimate the incidence rate ratio (RR) with 95% confidence intervals (95% CI) for the association between circulating PTH and CRC risk.
  
  
  RESULTS
  In multivariate analyses [including adjustment for 25(OH)D concentration] with a priori defined cutoff points, high levels of serum PTH (≥65 ng/L) compared with medium PTH levels of 30-65 ng/L were associated with increased CRC risk (RR = 1.41, 95% CI: 1.03-1.93). In analyses by sex, the CRC risk was 1.77 (95% CI: 1.14-2.75) and 1.15 (95% CI: 0.73-1.84) in men and women, respectively (P(heterogeneity) = 0.01). In subgroup analyses by anatomical subsite, the risk for colon cancer was RR = 1.56, 95% CI: 1.03-2.34, and for rectal cancer RR = 1.20, 95% CI: 0.72-2.01 (P(heterogeneity) = 0.21). Effect modification by various risk factors was examined.
  
  
  CONCLUSIONS
  The results of this study suggest that high serum PTH levels may be associated with incident, sporadic CRC in Western European populations, and in particular among men.
  
  
  CONCLUSIONS
  To our knowledge, this is the first study on PTH and CRC. The role of PTH in carcinogenesis needs to be further investigated.
authors.affiliation: Nutritional Epidemiology Group, International Agency for Research on Cancer, Lyon, France. fedirkov@fellows.iarc.fr
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authors.forename: Kay-Tee
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mesh_terms: D016022:Case-Control Studies; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000097:blood* / Q000175:diagnosis*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D052756:Nutritional Sciences; D010281:Parathyroid Hormone / Q000097:blood*; D011379:Prognosis; D011446:Prospective Studies; D012307:Risk Factors; D044465:White People
chemical_list: D010281:Parathyroid Hormone